Contents  on 11 February '12


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 11 February '12

No objects reported inside ten LD

No asteroids are reported to be within ten lunar distances (LD) of Earth today. Coming up, radar target 2011 CP4 arrives inside ten LD on February 22nd and 2008 EJ85 comes inside ten LD on March 4th.

This report was updated at 1653 UTC with new discovery 2012 CL17 (MPEC), which was inside ten LD earlier this month, and observation of 2011 CP4 from 2005 in today's DOU MPEC. This report was previously updated at 1612 UTC.

Notes: Ten LD has no astronomical significance but is a useful reporting boundary. Distances are interpreted by A/CC from JPL Horizons data. See also today's timeline plus current additional details, sky chart, and ephemerides.

NEOCP Activity  on 11 February '12

The MPC's NEO Confirmation Page has 4 listings

When last checked at 2350 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of eight listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 11 February '12

Minor Planet Electronic Circulars

As of last check at 2349 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-C42 - "13:25 UT" - 2012 CL17

MPEC 2012-C41 - "13:11 UT" - 2011 YU75

<< DOU on 11 Feb. '12 >>  MPEC 2012-C40 - "06:02 UT" - Daily Orbit Update

Observers  on 11 February '12

Eleven observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-C41 -- 2011 YU75
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-C40 & 2012-C41 -- 2012 CT, 2011 YU75, 32906, 143651, 138524, 138175, 7358, 2062
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-C40 -- 2012 CT
I17Cupillari Obs. in Pennsylvania, 4 in MPEC 2012-C40 -- 2012 BT23, 85839, 21088, 162186
F655David Asher in Northern Ireland via Faulkes Telescope North in Hawaii, 4 in MPEC 2012-C40 -- 2012 CC17, 2011 SL102, 2008 GE1, 2002 AW
E10Faulkes Telescope South in New South Wales, 2 in MPEC 2012-C40 -- 2012 BT23, 2011 YU62
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-C42 -- 2012 CL17
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2012-C40, 2012-C41 & 2012-C42 -- 2012 CL17, 2012 BD124, 2012 AC13, 2011 YU75, 90075, 314079, 312956
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2012-C40 -- 2008 GE1, 86667, 29075, 21088, 189008, 141056, 138911, 8567, 5836
J84South Obs. in England, 1 in MPEC 2012-C40 -- 2006 AL8
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2012-C40 & 2012-C41 -- 2011 YU75, 2011 CP4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 February '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2350 and JPL at 2349 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 CL17JPL Sentry16102095-2112201.8e-06-6.06-6.580JPL: "Analysis based on 16 observations spanning .94575 days (2012-Feb-10.31603 to 2012-Feb-11.26178)." Diameter approximately 0.025 km. from mean, weighted H=25.7.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 11 February '12

Times are UTC for when items were noted or added by The Tracking News.

1653Updated Traffic Report
1610Noted that JPL Sentry has posted 2012 CL17 as an impact risk - see above
Grabbed MPEC 2012-C40 - Daily Orbit Update - see above
Grabbed MPEC 2012-C41 - 2011 YU75 - see above
Grabbed MPEC 2012-C42 - 2012 CL17 - see above